10 Chemistry MCQS For Class Ten.

10 Chemistry MCQS FOR CLASS TEN

✅ Set 1: Chemical Reactions and Equations

1. What type of reaction is: Zn + H₂SO₄ → ZnSO₄ + H₂ ?
   a) Decomposition
   b) Combination
   c) Displacement
   d) Double displacement
   ✔️Answer: c) Displacement
   Explanation: Zinc displaces hydrogen from sulfuric acid.
2. Which of the following is a redox reaction?
   a) HCl + NaOH → NaCl + H₂O
   b) 2Mg + O₂ → 2MgO
   c) AgNO₃ + NaCl → AgCl + NaNO₃
   d) CaCO₃ → CaO + CO₂
   ✔️Answer: b) 2Mg + O₂ → 2MgO
   Explanation: Magnesium is oxidized; oxygen is reduced.
3. What is observed when lead nitrate is heated?
   a) Oxygen gas is released
   b) White precipitate forms
   c) Brown fumes of NO₂ are evolved
   d) Blue color is formed
   ✔️Answer: c) Brown fumes of NO₂ are evolved
   Explanation: It’s a thermal decomposition reaction.
4. Which substance is oxidized in the reaction: CuO + H₂ → Cu + H₂O?
   a) Cu
   b) H₂
   c) CuO
   d) H₂O
   ✔️Answer: b) H₂
   Explanation: Hydrogen loses electrons (oxidized).
5. What is the color of ferrous sulphate crystals?
   a) White
   b) Blue
   c) Green
   d) Yellow
   ✔️Answer: c) Green
   Explanation: FeSO₄·7H₂O crystals are light green.
6. Which of the following reactions is a combination reaction?
   a) NaOH + HCl → NaCl + H₂O
   b) CaO + H₂O → Ca(OH)₂
   c) 2KClO₃ → 2KCl + 3O₂
   d) AgNO₃ + NaCl → AgCl + NaNO₃
   ✔️Answer: b) CaO + H₂O → Ca(OH)₂
   Explanation: Two substances combine to form one product.
7. What is the balanced equation for combustion of methane?
   a) CH₄ + O₂ → CO₂ + H₂O
   b) CH₄ + 2O₂ → CO₂ + 2H₂O
   c) CH₄ + O₂ → CO + H₂O
   d) 2CH₄ + 3O₂ → 2CO + 4H₂O
   ✔️Answer: b) CH₄ + 2O₂ → CO₂ + 2H₂O
   Explanation: Complete combustion of methane.
8. Which of these is a double displacement reaction?
   a) Fe + CuSO₄ → FeSO₄ + Cu
   b) Pb(NO₃)₂ + 2KI → PbI₂ + 2KNO₃
   c) H₂ + O₂ → H₂O
   d) CaCO₃ → CaO + CO₂
   ✔️Answer: b) Pb(NO₃)₂ + 2KI → PbI₂ + 2KNO₃
   Explanation: Ions are exchanged between compounds.
9. What type of change is rusting of iron?
   a) Physical change
   b) Temporary change
   c) Chemical change
   d) Periodic change
   ✔️Answer: c) Chemical change
   Explanation: New substances like iron oxide form.
10. Which gas is evolved when zinc reacts with hydrochloric acid?
    a) Hydrogen
    b) Oxygen
    c) Nitrogen
    d) Carbon dioxide
    ✔️Answer: a) Hydrogen
    Explanation: Zn + 2HCl → ZnCl₂ + H₂↑